fyne-io / fyne / 6342533819

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Fix #4260: Synchronize access to fileDialog.data file list (#4279)

This change adds a RWMutex to synchronize access to the fileDialog.data file list.
The refreshDir function clears and rebuilds fileDialog.data, meanwhile, several other functions are indexing into it.
This allowed for scenarios where fileDialog.data was either nil or smaller than expected when indexing into it.

Fixes #4260

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